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Energy content of foods

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Title: Experiment showing energy content of different food items Aim: To see which food substance gives out the highest amount of energy. Hypothesis: I think that the food containing the most fat, will release the most energy content compared to the food with the lowest amount of fat. As fats contain 37kJ of energy per gram, compared to carbohydrate which provide about 17kJ per gram, and protein with about 14kJ per gram. Hence i feel that the cheese ball will give out the most energy as it contains the most amount of fat and seems to be the driest and thus it will burn easily and efficently. And the bread will give out the least as it seems to only contain carbohydrates and is not as dry as the other food items. Materials and equipment: > Bunsen burner > Clamp > Thermometer > Boiling tube > Tap water > Coloured marker > Retort stand > Measuring cylinder > Food items (four different types) > Measuring scale > Knife > Tongs > Saftey goggles Procedure 1. Boiling tube is attached to the retort stand via a clamp 2. ...read more.


27.0 49.0 41.3 21.6 13.2 Bread 1.45 1.25 27.0 31.0 29.2 3.5 2.2 Biscuit 3.06 3.45 27.0 73.3 80.0 45.6 52.1 Table 2 Table showing average change in temperature Food substance Average mass/g average Initial temperature/ �c Average final temprature of water/ �c Rise in temprature/�c Cheese ball 0.50 27.0 46.2 18.6 Twistys 0.93 27.0 45.1 17.9 Bread 1.35 27.0 30.1 2.8 Biscuits 3.25 27.0 76.6 48.8 Table 3 Table showing average energy content of foods Food substance Energy produced/joules per gram Cheese ball 3124.8 Twisty 1571.6 Bread 174.2 Biscuit 1261.2 DATA ANALYSIS Figure 1 Figure 2 Interpratation/Discussion Observations: Cheese ball: The cheese ball ignited easily, and stayed alight for a while before it had to be relighted. It burnt with a fairly bright and large flame. However, it completley burnt out, turning black, very quickly, and was the fastest food substance to burn completly and released the highest amount of energy (3124.8j) Twistys: The twisty crisp, burnt with a bright and large flame, it took two tries to ignite it however once it was ignited it stayed on fire this was mainly due to the fact that it was dry hence lighting it was no problem. ...read more.


Evaluation: There were alot of factors which affected the results obtained from the experiment. A large amount of heat was lost to the surrounding air thus lowering the temperature reading. Another factor affecting the experiment was the oil/grease which dripped off some of the foods used. The oil/grease contained extra energy which unfortunatly could not be measured hence affecting the results obtained. However even though these problems were encountered enough data was collected in order to make a conclusion. Suggestions to improve: I feel that if given a wider range of food substances and more time, more data could be extracted from the experiment. Also if all the food substances had nutritional information on the pack like the twisty and cheese ball it would be easier to conclude how accurate my hypothesis was. Conclusion: My hypotheses were correct. From the above experiment it can be concluded that the cheese ball provided the most amount of energy, due to its high fat content. With the twisty close behind then the biscuit. Then with the least amount of energy, the bread containing high carbohydrate and low fat content. ?? ?? ?? ?? ...read more.

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Here's what a teacher thought of this essay

3 star(s)

This is a good report of a well carried out practical that can be improved by working on specific sections.
1. The results table is very well presented.
2. The data is displayed well in the graph and pie chart.
3. The language used is appropriate and consistent throughout.
4. There should be an introduction that included referenced background information.
5. The conclusion section should come after the observations and should be explained and backed up using data that has been collected.
6. The evaluation section should be lengthened to include additional ways to improve the data collected.
*** (3 stars)

Marked by teacher Luke Smithen 01/05/2013

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